20mm PTFE Septa Supplier--Aijiren Vials for HPLC/GC. 24mm Silicone/PTFE Septa is matched with 24mm screw neck cap, suitable for 24mm screw sample storage vial. Aijiren has an exclusive production technology that can compound PTFE and Silicone without adding any adhesives, so Aijiren’s Septa is soft and not easily deformed. Send Inquiry Chat Now.